mirror of
https://github.com/mainflux/mainflux.git
synced 2025-04-27 13:48:49 +08:00
98aa270b14
Bumps [github.com/lestrrat-go/jwx/v2](https://github.com/lestrrat-go/jwx) from 2.0.8 to 2.0.11. - [Release notes](https://github.com/lestrrat-go/jwx/releases) - [Changelog](https://github.com/lestrrat-go/jwx/blob/develop/v2/Changes) - [Commits](https://github.com/lestrrat-go/jwx/compare/v2.0.8...v2.0.11) --- updated-dependencies: - dependency-name: github.com/lestrrat-go/jwx/v2 dependency-type: direct:production ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
//go:build amd64 && !purego
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// +build amd64,!purego
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package base64
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import (
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"encoding/base64"
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"github.com/segmentio/asm/cpu"
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"github.com/segmentio/asm/cpu/x86"
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)
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const (
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encLutSize = 32
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decLutSize = 48
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minEncodeLen = 28
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minDecodeLen = 45
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)
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func newEncoding(encoder string) *Encoding {
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e := &Encoding{base: base64.NewEncoding(encoder)}
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if cpu.X86.Has(x86.AVX2) {
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e.enableEncodeAVX2(encoder)
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e.enableDecodeAVX2(encoder)
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}
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return e
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}
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func (e *Encoding) enableEncodeAVX2(encoder string) {
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// Translate values 0..63 to the Base64 alphabet. There are five sets:
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//
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// From To Add Index Example
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// [0..25] [65..90] +65 0 ABCDEFGHIJKLMNOPQRSTUVWXYZ
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// [26..51] [97..122] +71 1 abcdefghijklmnopqrstuvwxyz
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// [52..61] [48..57] -4 [2..11] 0123456789
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// [62] [43] -19 12 +
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// [63] [47] -16 13 /
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tab := [encLutSize]int8{int8(encoder[0]), int8(encoder[letterRange]) - letterRange}
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for i, ch := range encoder[2*letterRange:] {
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tab[2+i] = int8(ch) - 2*letterRange - int8(i)
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}
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e.enc = encodeAVX2
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e.enclut = tab
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}
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func (e *Encoding) enableDecodeAVX2(encoder string) {
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c62, c63 := int8(encoder[62]), int8(encoder[63])
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url := c63 == '_'
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if url {
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c63 = '/'
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}
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// Translate values from the Base64 alphabet using five sets. Values outside
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// of these ranges are considered invalid:
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//
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// From To Add Index Example
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// [47] [63] +16 1 /
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// [43] [62] +19 2 +
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// [48..57] [52..61] +4 3 0123456789
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// [65..90] [0..25] -65 4,5 ABCDEFGHIJKLMNOPQRSTUVWXYZ
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// [97..122] [26..51] -71 6,7 abcdefghijklmnopqrstuvwxyz
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tab := [decLutSize]int8{
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0, 63 - c63, 62 - c62, 4, -65, -65, -71, -71,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x15, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
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0x11, 0x11, 0x13, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B,
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}
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tab[(c62&15)+16] = 0x1A
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tab[(c63&15)+16] = 0x1A
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if url {
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e.dec = decodeAVX2URI
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} else {
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e.dec = decodeAVX2
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}
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e.declut = tab
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}
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